JollyJack, the EEOI that you have posted the link to is perhaps just one part of the SEEMP. This can be used to quantify the amount of GHG produced during a voyage. You can use it to find tonnes of fuel consumed per nautical mile steamed, grammes of CO2 produced per nautical mile steamed, tonnes of fuel consumed per tinne of cargo discharged, etc.
As I am not the most computer savvy, I didn't try to post a link to the document here, but if one were to Google - MEPC 62/INF.10, they would (should??) find the IMO document with an example of an SEEMP within, it's a 39 page PDF.
I spent a large part of last year trying to come to grips with getting ours into shape, and I suppose we have something acceptable. At least a couple of PSC inspectors and SIRE auditors thought so anyway, which is good enough for me!!
Hope this helps.